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Test Code IOCA Calcium, Ionized

Specimen Type

Blood

Container

Mint green top with gel separator

Preferred Volume

3.5 mL

Offsite Collection Instructions

The tube for the ionized calcium MUST REMAIN CAPPED to prevent exposure to air.

UCMC Collection Instructions

The tube for the ionized calcium MUST REMAIN CAPPED to prevent exposure to air.

Availability

24/7

Turnaround Time

3 hours

STAT Availability

Available

Test Usage

Useful in assessing calcium states during any procedure requiring rapid transfusion of whole blood in neonates and in critically ill patients.
Second-order test in the evaluation of patients with abnormal calcium values.

Test Methodology

Ion-specific electrode

Additional Information

Ionized calcium values vary inversely with pH, approximately 0.2 mg/dL per 0.1 pH unit change.

CPT Code

82330

STAT Turnaround Time

1 hour

Reference Range

4.60 – 5.40 mg/dL

Critical Results

None

Test Limitations

Gross hemolysis may falsely elevates results.
Patients receiving citrate-containing blood or blood fractions may have increased total serum calcium, despite decreased ionized calcium.
Low protein stores may falsely lower results.

Minimum Volume

2 mL

Coverage Information

CMS local coverage decision for “Ionized Calcium” retired effective 3/14/12. For more details click this link:

 

lcd-details.aspx

Test Includes

Quantitative determination of ionized calcium in plasma

Fee Code

43475